SurfaceView实例

package com.demo;

import java.util.Vector;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.ViewGroup.LayoutParams;

public class SurfaceViewDemoActivity extends Activity {

    SurfaceHolder sh = null;
    Vector<Float> vx = new Vector<Float>();
    Vector<Float> vy = new Vector<Float>();

    @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);



        SurView surView = new SurView(this);
        setContentView(surView);

    }

class SurView extends SurfaceView implements SurfaceHolder.Callback {

public SurView(Context context) {
super(context);

            sh = getHolder();
            sh.addCallback(this);
        }

        @Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub

        }

        @Override
public void surfaceCreated(SurfaceHolder holder) {
new Thread(new SurLoop()).start();

        }

        @Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub

        }

public void doDraw(Canvas canvas) {
super.onDraw(canvas);
            canvas.drawColor(Color.GRAY);
            Paint paint = new Paint();
            paint.setAntiAlias(true);
            paint.setColor(Color.BLUE);
            paint.setStyle(Style.STROKE);
for (int i = 0; i < vx.size(); i++) {
                canvas.drawCircle(vx.elementAt(i), vy.elementAt(i), 10, paint);
            }
        }

        @Override
public boolean onTouchEvent(MotionEvent event) {

if (event.getAction() == MotionEvent.ACTION_DOWN) {
                vx.add(event.getX());
                vy.add(event.getY());
            }
return true;
        }

class SurLoop implements Runnable {

            @Override
public void run() {
while (true) {
try {
                        Canvas canvas = sh.lockCanvas();
                        doDraw(canvas);
                        sh.unlockCanvasAndPost(canvas);
                        Thread.sleep(20);
                    } catch (Exception e) {
                    }
                }
            }
        }

    }

}